
public class Circle {
	public double radius;
	
	public  Circle() {
		
	}
	
	public Circle(double Radius){
		this.radius = Radius;
	}
	double perimeter(){
		return 2*Math.PI*radius ;
	}
	
	double area(){
		return Math.PI*radius*radius;
	}
	void print(){
		System.out.println("所计算的圆形半径:"+radius+"\n周长:"+perimeter()+"\n面积:"+area());
	}

}